Preconditioned cell array optimized for a three-dimensional culture of hepatocytes

Area of Science:

• Cell Biology
• Biotechnology
• Biomedical Engineering

Background:

• Three-dimensional (3D) cell culture methods are increasingly important in cell biology.
• Standardizing spheroid size and maintaining cell viability are critical challenges in 3D cell culture.
• Hepatocyte spheroids are valuable for drug metabolism studies.

Purpose of the Study:

• To develop a cryopreservable cell array for simplified and standardized hepatocyte spheroid culture.
• To evaluate the efficacy of cryopreserved feeder cells in maintaining hepatocyte spheroid morphology and function.
• To reduce the time and labor associated with preparing cell arrays for hepatocyte culture.

Main Methods:

• Development of a cell array utilizing micropatterning with a hydrophilic polymer for size standardization.
• Incorporation of bovine carotid artery-derived HH cells as feeder cells for spheroid maintenance.
• Cryopreservation of the feeder cell-cultured array using a freezing medium containing dimethyl sulfoxide.
• Thawing and subsequent inoculation with rat hepatocytes.

Main Results:

• Cryopreservation and thawing of the HH cell array preserved feeder cell morphology and biological activity.
• Rat hepatocytes formed uniform spheroids on cryopreserved arrays, comparable to fresh arrays.
• Hepatocyte CYP3A drug metabolism activity was well-maintained on both cryopreserved and fresh cell arrays.
• The protocol significantly reduced preparation time and labor for cell arrays.

Conclusions:

• A cryopreservable cell array provides a ready-to-use platform for reproducible hepatocyte spheroid formation.
• This innovation simplifies 3D cell culture protocols, enhancing standardization and efficiency.
• The method supports the maintenance of hepatocyte function, crucial for drug discovery and toxicology.